A.a=1.6m，b=3.6m B.a=1.8m，b=3.6m C.a=1.6m，b=3.7m D.a=1.9m，b=3.4m

题目

A.a=1.6m，b=3.6m
B.a=1.8m，b=3.6m
C.a=1.6m，b=3.7m
D.a=1.9m，b=3.4m
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